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V. l. MONCRIEFF.

INTERNAL coNlusloN ENGINE.

APPLfxcATloN mEo'xuNE 7, 1920.

Patented Apr. 12, 1921.

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UNITED STATES' "PATENT oFFlCE.

vsioN I. monomers', or INnIANAPoLIs, INDIANA,A

' INTERNAL-conansrron ENGINE.

Be it known that l, :VEON l. MQNCRIEFF, aV citizen of the United States, residing at Indianapolis, in the"countyof Marion and Sta-te ofndiana', have invented anew and useful Internal- Combustion Engine, ofV which the following'isV a specification.

'The object ofrmy invention is to provide certain improvements in internal y combustionv engines, whereby a scavenging charge of'air may be caused to drive outtheprod-V uetsof combustion from the worlrchamber and be followed by acharge of fuelunder The a ceo,mp'anying drawings illustrate my invention. -Fig'ure 1 A4is a side elevationfof an engine embodying, my invention,some of the parts being shown in vertical section; Fig. 2 is an end elevation, some of the parts being shown in vertical section.

Inv the drawings, 10 indicates a cylinder, 11 a piston, 12 a piston rod, and 18 a cranlr shaft of ordinary construction.

Each cylinder is provided with normally closed air inlet valve la and a normally closed fuel inlet valve 15, each of said valves being conveniently normally closedv by a spring 16 opened at the proper time by a cam 1'? on a cam shaft 18.

At the outer end of each cylinder 10 is an exhaust port 19, which is uncovered and covered by piston 11.

Leading-to the several airvalves 1a is an air manifold 20, which is vconnected to an air- In the form shown in the drawings, the

two air chambers 21 and 25 are formed in a single hollow casting 26 bolted to the end of the crank case 27 and provided with an internal partition 28 (Fig. 2) which separates the interior into the two chambers 21 and 25.

lleadirr` into chamber 21 are supply open-4 lApplication led lune 7, 1920. Serial No. 386,958.

Patented Apr. 12,1921.

deliver air to the openings 30 into chamber 21 andthe other two of which deliver air through openings 31 into'chamber 25.A One of the gearsI 87 is attached to" crank shaft gearsvis attached toV 4the appropriate flushing valve 111 isr opened and flushing air under pressure, passes from chamber 21 through manifold20 into the initial end of the cylinder 10, driving `the exhaust gases in front of it and toward the yexhaust passage 19. Y

W hen the piston 11 has started upon its return stroke and preferably slightly beforeit has closed the exhaust passage 19, the

flushing valve 14 is closed and the fuel valve 15 is opened, whereupon, air is permitted to flow chamber 25 through to the carbureter supply pipe 24 into and through carbureter23 and into and through manifold 22, the fuel inlet valve 15 being held open as long as desired, at least up to the time when the compression produced by the return movement of piston 11 nearly equals the supply pressure in chamber 25.

It ,will be readily understood that while rthe specific form and arrangement of air pump shown isvery convenient, yet, nevertheless, material modiiications of the pump may be made without departing from my in,l

vention.

l claim as my invention: v

1. ln an internal combustion engine, the combination with a cylinder and piston, wherein the cylinder is provided with an exhaust port covered and uncovered by the piston, of two inlet valves, means for open- Ving and closing said inlet valves vin succession, means for delivering flushing air to one of said valves under pressure, and means for delivering fuel under pressure to the other of said valves.

2. ln an internal combustion engine, the

combination with a worlr cylinder of two inlet valves for said cylinder, means for opening and closing said valves in succession, means for exhausting the spentgases at the end of the work stroke, and means for supplying air under pressure to one of the inlet valves and for supplying fuel under pressure to the other of said inlet valves, said fuel inlet valve being opened and closed during each return stroke of the piston.

3. In an internal combustion engine, the combination with the combustion chamber, piston, crank shaft and casing, of a series of intermeshing lobed im ellers, one carried by the crank shaft, a casing for said impellers provided with inlet and outlet passages coordinated with said impellers, tWo inlet valves for the combustion chamber, said inlet valve controlling How of air under pressure from said impellers to the combustion chamber, a second inlet valve controlling iow of fuel to said combustion chamber under pressure introduced by said lobed impellers, and means for successively opening and closing said inlet Valve, said means comprising a valve-operating shaft connected to one of said lobed impellers.

4. In an internal combustion engine, the combination with the combustion chamber, piston, crank shaft and casing, of a series of intermeshing lobed impellers, one carried by the crank shaft, a casing for said impellers provided with inlet and outlet passa es coordinated With said impellers, two

in et valves for the combustion chamber, said inlet valve controlling flow of air under pressure from said impellers to the combustion chamber, a second inlet valve controllin flow of fuel to said combustion chamber un er pressure introduced by said lobed impellers, and means for successively opening and closing said inlet valve.

5. In an internal combustion engine, the combination with a. cylinder and piston, wherein the cylinder is provided with an exhaust pa at the outer end of the cylinder and withvan inlet passage at the inner end of the cylinder, of means for introducing a stream of ushing gas under pressure immediatel following initial exhaust, and means or introducing a fuel stream: under pressure into the initial end ofthe cylinder following the inflow of ushs. mIn witness whereof I have hereunto set my hand at Indianapolis, Indiana, this 3rd day of June, A. D. one thousand nine hundred and twenty.

VEON I. MON CRIEFF. 

